Which retail technology innovation was first widely implemented in South Korea before spreading globally?

In the evolving landscape of retail technology, geographic considerations significantly impact deployment strategies and consumer adoption. Regional infrastructure, cultural preferences, and technological readiness create vastly different retail environments across the globe. This trivia question explores how leading retailers leverage location-based technology to enhance customer experiences in specific geographic contexts.

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Virtual shopping walls in subway stations allowing commuters to scan QR codes to purchase groceries for home delivery
Facial recognition payment systems that eliminate the need for physical cards or mobile devices
Augmented reality mirrors that overlay clothing options on shoppers without trying items on
Automated drone delivery systems for urban last-mile fulfillment